Lightroom locks up in Windows 10, Error message: could not call C function: private load core tech Must close program from Task Manager.

I run Windows 10, 64 bit. Lightroom free trial has been downloaded and installed. I have signed into my account. I have attempted to import files including Lightroom samples. Lightroom locks up and won’t load. Error message: could not call C function: private load core tech. I have to close program from Task Manager.